You can but a cheap one at a place like Target or even the grocery store.

Here is a link to one ...

http://www.thinkgeek.com/computing/a...s/2940/action/

Or I like to buy everything from Amazon ... You can just Google monitor mirror o shop around.

http://www.amazon.com/s/ref=nb_ss_gw...mirror&x=0&y=0

I hope it helps!
Xree